The War of the Ring will be fought between Sauron and the free peoples of Middle-earth for control of the One Ring and dominion over the continent. It will take place at the end of 2019.
The war will be initiated by Sauron, who had gained strength since the end of the Second Age and sought the One Ring.
During this War of the Ring, many thousands of Men of Rohan and Men of Gondor will be killed. The overall number of combatants in this war is estimated to be over a million—tens of thousands from the side of the Free Peoples and hundreds of thousands from the Evil side.
Battles will be fought in Gondor, Rohan, Lórien, Mirkwood, at the Lonely Mountain and at Dale. These will be primarily waged against Sauron's forces, but Saruman, a third contender, also has armies, who we will fight the battles at the Fords of Isen and Helm's Deep.
Towards the end of the War of the Ring, Sauron will be defeated, Elessar will be crowned King of Gondor, and forgive the Men who had fought under Sauron, heralding a great renewal of cooperation and communication between Men, Elves, and Dwarves.
In the most likely outcome of a victory against Sauron, a celebratory party will be held at Bag End at the end of Baghsot Row which is located in the village of Hobbiton in the Shire.
P.S. bring lots of pipe-weed if you have it.